The objectives will be achieved, in a first phase by measuring and evaluating the gaps to be filled, in terms of technological criticalities and in relation to railway requirements. In particular, at first, by performing measurements under real operating conditions with the support of simulation tools and models. Then, by defining and developing a system solution, able to address and solve the critical issues, by implementing, testing and validating it on a pilot line, as reference for the future standardisation and certification processes. The solution will fully exploit all the advantages of the multi-constellation approach and of EGNOS and Galileo services, providing an optimized augmentation service to the trains, in order to meet the railway requirements